For future reference
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Use double quotes ( " " ) for everything. It drives me nuts whenever I see people using single quotes when they're supposed to use double quotes. Don't be one of those people. If you continue, I shall be forced to think very judgmental things about your ability to hit the shift key on your keyboard.
I am a minimalist sometimes, Mr Two-spaces. :P
I use extra spaces everywhere when editing to help me differentiate between different chunks of wikicode (including where one sentence ends and another begins). I wish I could hit "enter" for a line break after every reference tag, too, so I didn't have to squint to differentiate references from the rest of the text anymore, but that gets rendered as spaces before and between references.
It makes sense to use single-quotes for scarequotes or titles.